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//-----------------------------------------------------------------------------
// Name: image_sampler.cpp
// Developer: Wolfire Games LLC
// Description:
// License: Read below
//-----------------------------------------------------------------------------
//
//
// Copyright 2022 Wolfire Games LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//-----------------------------------------------------------------------------
#include "image_sampler.h"
#include <Asset/AssetLoader/fallbackassetloader.h>
#include <Asset/assetloaderrors.h>
#include <Internal/cachefile.h>
#include <Internal/common.h>
#include <Internal/filesystem.h>
#include <Internal/error.h>
#include <Compat/fileio.h>
#include <cerrno>
#include <sstream>
#include <cstring>
#include <algorithm>
using std::max;
using std::min;
namespace {
const char* suffix = "_image_sample_cache";
}
ImageSampler::ImageSampler(AssetManager* owner, uint32_t asset_id) : Asset(owner, asset_id) {
}
vec4 ImageSampler::GetInterpolatedColorUV(float x, float y) const {
x = max(0.01f, min(0.99f, x));
y = max(0.01f, min(0.99f, y));
return GetInterpolatedColor(x * width_ + 0.5f, y * height_ + 1.0f);
}
vec4 ImageSampler::GetInterpolatedColor(float x, float y) const {
byte4 top_left = GetPixel((int)x, (int)y);
byte4 top_right = GetPixel((int)(x + 1), (int)y);
byte4 bottom_left = GetPixel((int)x, (int)(y + 1));
byte4 bottom_right = GetPixel((int)(x + 1), (int)(y + 1));
;
float x_weight = x - (int)x;
float y_weight = y - (int)y;
vec3 left;
left[0] = (uint8_t)(top_left[0] * (1 - y_weight) + bottom_left[0] * (y_weight));
left[1] = (uint8_t)(top_left[1] * (1 - y_weight) + bottom_left[1] * (y_weight));
left[2] = (uint8_t)(top_left[2] * (1 - y_weight) + bottom_left[2] * (y_weight));
vec3 right;
right[0] = (uint8_t)(top_right[0] * (1 - y_weight) + bottom_right[0] * (y_weight));
right[1] = (uint8_t)(top_right[1] * (1 - y_weight) + bottom_right[1] * (y_weight));
right[2] = (uint8_t)(top_right[2] * (1 - y_weight) + bottom_right[2] * (y_weight));
vec3 value(0.0f);
value.r() = ((uint8_t)(left[0] * (1 - x_weight) + right[0] * (x_weight))) / 255.0f;
value.g() = ((uint8_t)(left[1] * (1 - x_weight) + right[1] * (x_weight))) / 255.0f;
value.b() = ((uint8_t)(left[2] * (1 - x_weight) + right[2] * (x_weight))) / 255.0f;
return value;
}
ImageSampler::byte4 ImageSampler::GetPixel(int x, int y) const {
x = max(0, min(width_ - 1, x));
y = max(0, min(height_ - 1, y));
return pixels_[x * height_ + y];
}
int ImageSampler::Load(const std::string& path, uint32_t load_flags) {
std::string load_path;
ModID cache_modsource;
bool loaded_cache = false;
if (CacheFile::CheckForCache(path_, suffix, &load_path, &cache_modsource, &checksum_)) {
if (ReadCacheFile(load_path, checksum_)) {
loaded_cache = true;
LOGI << "Loaded cache file " << load_path << std::endl;
modsource_ = cache_modsource;
}
}
if (loaded_cache == false) {
char abs_path[kPathSize];
ModID modsource;
if (FindImagePath(path.c_str(), abs_path, kPathSize, kDataPaths | kModPaths | kWriteDir | kModWriteDirs, true, NULL, false, false, &modsource) == -1) {
return kLoadErrorMissingFile;
}
LOGI << "Loading " << abs_path << std::endl;
/*
if(FindFilePath(path.c_str(), abs_path, kPathSize, kDataPaths | kModPaths | kWriteDir) == -1){
FatalError("Error", "Could not find image sampler file \"%s\"", path_.c_str());
}
*/
int n = 0;
// Tell stb_image that we want 4 components (RGBA)
stbi_uc* data = stbi_load(abs_path, &width_, &width_, &n, 4);
if (data == nullptr || n != 4) {
return kLoadErrorGeneralFileError;
}
pixels_.resize(width_ * height_);
std::memcpy(pixels_.data(), data, width_ * height_ * 4);
stbi_image_free(data);
char write_path[kPathSize];
FormatString(write_path, kPathSize, "%s%s%s", GetWritePath(modsource).c_str(), path.c_str(), suffix);
modsource_ = modsource;
WriteCacheFile(write_path);
}
return kLoadOk;
}
const char* ImageSampler::GetLoadErrorString() {
switch (sub_error) {
case 0:
return "";
default:
return "Unknown error";
}
}
void ImageSampler::Unload() {
}
void ImageSampler::Reload() {
}
void ImageSampler::ReportLoad() {
}
bool ImageSampler::GetCachePath(std::string* dst) {
if (!CacheFile::CheckForCache(path_, suffix, dst, &checksum_)) {
DisplayError("Error", ("Could not find cache file for " + path_).c_str());
return false;
}
return true;
}
bool ImageSampler::ReadCacheFile(const std::string& path, uint16_t checksum) {
FILE* file = my_fopen(path.c_str(), "rb");
if (!file) {
return false;
}
CacheFile::ScopedFileCloser file_closer(file);
unsigned char version;
fread(&version, sizeof(version), 1, file);
if (version != kImageSamplerCacheVersion) {
return false;
}
uint16_t file_checksum;
fread(&file_checksum, sizeof(file_checksum), 1, file);
if (checksum != 0 && checksum != file_checksum) {
return false;
}
fread(&width_, sizeof(width_), 1, file);
fread(&height_, sizeof(height_), 1, file);
if (width_ <= 0 || height_ <= 0) {
return false;
}
pixels_.resize(width_ * height_);
fread(&pixels_[0], sizeof(pixels_[0]) * width_ * height_, 1, file);
return true;
}
void ImageSampler::WriteCacheFile(const std::string& path) {
FILE* file = my_fopen(path.c_str(), "wb");
if (!file) {
FatalError("Error", "Could not write file \"%s\" because of error \"%s\"", path.c_str(), strerror(errno));
}
CacheFile::ScopedFileCloser file_closer(file);
unsigned char version = kImageSamplerCacheVersion;
fwrite(&version, sizeof(version), 1, file);
fwrite(&checksum_, sizeof(checksum_), 1, file);
fwrite(&width_, sizeof(width_), 1, file);
fwrite(&height_, sizeof(height_), 1, file);
fwrite(&pixels_[0], sizeof(pixels_[0]), width_ * height_, file);
}
AssetLoaderBase* ImageSampler::NewLoader() {
return new FallbackAssetLoader<ImageSampler>();
}
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